Anthropic deprecations and shutdown dates

Deprecations, shutdowns and breaking changes Anthropic has announced, from its official changelogs and reviewed by the StackClock team.

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AnthropichighShutdown

2026-09-30: Claude Sonnet 4.5 model 

Takes effect 30 Nov 2026 · published 4 Oct 2026

On September 30, 2026, Anthropic notified developers using Claude Sonnet 4.5 of its upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement November 30, 2026 claude-sonnet-4-5-20250929 claude-sonnet-5-5

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